Multimodal Audio Decoder Error Concealment
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Solution Overview
Problem
Existing adaptive distribution formats for audiovisual media struggle with bandwidth efficiency, computational efficiency, error resilience, and seamless bitrate switching, particularly in environments with transient bitrate limitations, leading to noticeable disruptions in media streaming.
Innovation Solution
A multimodal decoding system that adapts between parametric, discrete, and keep modes to reconstruct n-channel audio signals by selecting the appropriate mode based on the current and previous frames' coding regimes, using a controller to manage mode transitions and error handling, ensuring continuous audio output even with defective frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If adaptive distribution format switches between higher-bitrate and lower-bitrate modes, then bandwidth efficiency is improved, but error resilience deteriorates due to increased vulnerability to data losses during streaming
Solution Approach 1:
The system dynamically switches between higher-bitrate and lower-bitrate modes based on network conditions, making the distribution format adaptable rather than static. This dynamic adaptation allows the system to optimize bandwidth efficiency while maintaining error resilience through appropriate mode selection and transition management.
Solution Approach 2:
The patent implements preparatory measures for error handling by introducing redundancy mechanisms and error concealment strategies before data losses occur. This includes using robust coding schemes and maintaining buffer states that can compensate for potential packet losses, thereby cushioning the impact of errors during streaming.
2Quantity of substance
If adaptive distribution format is implemented, then bandwidth efficiency is improved, but device complexity increases due to multiple coding modes and transition management
Solution Approach 1:
The patent designs a universal coding framework that can operate in multiple modes (higher-bitrate and lower-bitrate) within a single system architecture. This multi-functional approach allows the same decoding system to handle different bitrate conditions without requiring separate dedicated systems, thereby managing complexity while maintaining bandwidth efficiency.
Solution Approach 2:
The system manages complexity by changing operational parameters (bitrate mode, coding scheme) rather than restructuring the entire system architecture. This allows adaptive distribution to be achieved through parameter adjustment and mode switching within an existing framework, reducing the need for complex additional components.
3Adaptability or versatility
If seamless bitrate switching is implemented, then adaptability to network conditions is improved, but noticeable disruptions occur during mode transitions
Solution Approach 1:
The patent prepares for mode transitions in advance by pre-processing data and maintaining buffer states that facilitate smooth switching. This preliminary preparation ensures that when bitrate mode changes occur, the transition is seamless and imperceptible to the end user, maintaining adaptability while eliminating disruptions.
Solution Approach 2:
The system maintains continuous audio output and decoding operations during mode transitions, ensuring that the useful action of audio playback never interruptions. This continuity is achieved through careful buffer management and cross-fading techniques that bridge the transition between different bitrate modes without creating perceptible gaps or disruptions.
Data Source
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AI summary
A decoding system reconstructs an audio signal based on an input signal representing the audio signal by parametric coding or by n discretely coded channels. Parametric decoding proceeds on the basis of a core signal and mixing parameters controlling a spatial synthesis stage, which is supplied with a downmix signal. A controller is responsible for controlling the components of the decoding system, whether in steady-state parametric mode, steady-state discrete decoding mode and transitions between these. In defective frames of the input signal, which do not allow the mixing parameters to be decoded, the controller is configured to perform various error handling procedures including: parametric decoding using previous values of the mixing parameters; continuing parametric decoding for a limited duration, and/or outputting the core signal without spatial synthesis.